Li Sujie (李素節) (646 – June 24, 690), formally the Prince of Xu (許王), was an imperial prince of the Chinese dynasty Tang Dynasty. He was the fourth son of Emperor Gaozong, born of his one-time favorite Consort Xiao. After Consort Xiao and Emperor Gaozong's wife Empress Wang were deposed and executed due to the machinations of Emperor Gaozong's second wife Empress Wu (later known as Wu Zetian), Li Sujie was under the watchful eyes of Empress Wu, and was several times demoted on accusations of misbehavior. In 690, with Empress Wu serving as empress dowager and regent over her son Emperor Ruizong, she began to massacre Tang imperial clan members in preparation of seizing the throne herself, and she summoned Li Sujie and his older brother Li Shangjin (李上金) to the then-capital Luoyang. When they arrived near Luoyang, Empress Dowager Wu had him strangled, while Li Shangjin committed suicide.
Li Sujie was born in 646, when his father Li Zhi was crown prince under his grandfather Emperor Taizong. He was Li Zhi's fourth son, and he was born of Li Zhi's then-favorite concubine, Consort Xiao. After Emperor Taizong's death in 649, Li Zhi succeeded him (as Emperor Gaozong), and in 651 created Li Sujie the Prince of Yong and gave him titularly the important post of prefect of the capital prefecture, Yong Prefecture (雍州, roughly modern Xi'an, Shaanxi). It was said that Li Sujie could recite 500-word ancient poems, and was studious in studying under the scholar Xu Qidan (徐齊聃). He was said to be much loved by Emperor Gaozong. When he grew older, he was made the prefect of Qi Prefecture (岐州, roughly modern Baoji, Shaanxi).